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Abstract Early in the investigation of butadiene-styrene copolymers as synthetic rubbers, this laboratory became interested in copolymers containing much more styrene than any of the American or German synthetics. This interest was soon directed to the resinous copolymers obtained when the styrene content is increased…
X-ray and microscope investigations of numerous specimens of so-called klaprothite from copper-bismuth ores of the type locality Schapbach valley, Baden, Germany and other localities, show that the specimens are actually wittichenite and emplecite and other known minerals.
The theory of the scattering of x-rays at small angles is given for a continuous distribution in size of randomly spaced and oriented spheroidal particles having arbitrary, but fixed, shape. Families of scattering curves are presented for spheres, and for spheroids ranging in shape from flat disks to long rods. Both M…
The name ‘halloysite’, first used in 1826 by Berthier, is derived from that of Omalius d'Halloy, who found the mineral in Angleur, Liége, Belgium. In 1935, Mehmel discovered that there were two distinct substances included under the name halloysite, one of which contains loosely bound water and shows a 10 Å. basal ref…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical and Chemical Properties of Pure FluorocarbonsR. Fowler, J. Hamilton, Jr., J. Kasper, C. Weber, W. Burford III, and H. AndersonCite this: Ind. Eng. Chem. 1947, 39, 3, 375–378Publication Date (Print):March 1, 1947Publication History Published online31 January 2005Publ…
An important delayed-fracture effect is found for mineral glass. A likely cause might be the gradual spread of Griffith cracks, but a theorem due to Griffith states that cracks do not spread below a certain average stress, and that at this stress they spread catastrophically. In the present paper, Griffith's theorem i…
The general approximate theory of x-ray scattering at small angles by finely divided solids is reviewed. It is assumed that the x-ray scattering data can be interpreted in terms of a particle size distribution, with particle-to-particle scattering negligible. Scattered intensity curves for Maxwellian, Gaussian, and re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCONDENSATION OF AROMATIC ALDEHYDES WITH α-PICOLINE METHIODIDEARTHUR P. PHILLIPSCite this: J. Org. Chem. 1947, 12, 2, 333–341Publication Date (Print):March 1, 1947Publication History Published online1 May 2002Published inissue 1 March 1947https://pubs.acs.org/doi/10.1021/jo01…
The properties of dislocations are calculated by an approximate method due to Peierls. The width of a dislocation is small, displacements comparable with the interatomic distance being confined to a few atoms. The shear stress required to move a dislocation in an otherwise perfect lattice is of the order of a thousand…
Abstract It is shown that the theory of dielectric breakdown in solids previously developed by the author is correct only below a critical temperature Tc. This temperature is defined in such a way that above Tc the density of electrons (in strong fields) is so high that mutual collisions between electrons are more fre…
A bstract The reducibility of a number of ions by dry hydrogen was studied in various glass compositions. Reduction temperatures with dry hydrogen were about 75° C, lower than with wet hydrogen. The glasses contained 5.0% of Sb 2 O 3 , Bi 2 O 3 , or PbO or 0.1% of Ag 2 O. In all of the glasses, silver ions were reduce…
Summary Technical mono‐ and diglyceride products have been prepared from cottonseed oil stearine, and the effectiveness of these products in lowering the interfacial tension at vegetable oil‐water interfaces has been investigated. When both monoglycerides and diglycerides are present in the oil phase, the surface acti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonoalkyibenzenes by Vapor-Phase Alkylation with Silica-alumina CatalystA. A. O'Kelly, J. Kellett, and J. PluckerCite this: Ind. Eng. Chem. 1947, 39, 2, 154–158Publication Date (Print):February 1, 1947Publication History Published online1 May 2002Published inissue 1 February…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTContrast in the Dimerization of Polychloro- and Polyfluoro-ethyleneAlbert L. Henne and Robert P. RuhCite this: J. Am. Chem. Soc. 1947, 69, 2, 279–281Publication Date (Print):February 1, 1947Publication History Published online1 May 2002Published inissue 1 February 1947https:…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRate of the Thermal Isomerization of α-Pinene in the Liquid Phase1Robert E. Fuguitt and J. Erskine HawkinsCite this: J. Am. Chem. Soc. 1947, 69, 2, 319–322Publication Date (Print):February 1, 1947Publication History Published online1 May 2002Published inissue 1 February 1947…
A significant change is reported in mean particle size and shape characteristics of carbon black due to specimen contamination while under examination in electron microscopes. The effect is described for a number of well-known commercial blacks and examples are given in graphical form to illustrate expected variations…
Abstract The phase separation in solutions of high polymers in the same solvent (technically known as incompatibility) has been studied for fourteen high polymers (cellulose, vinyl, and acrylic derivatives) dissolved in thirteen solvents. The influence of solvent, concentration, molecular weight and constitution of th…
AdsOJ'ption of water vapor by untanned hide and variou tannages oJ leather was determined at relative humidities rangin g from 0 to 96 percent at 100 F. The Brunauer, Emmett, and T eller equations for adsorption of gases in multimolecular layers we re applied to the data. Adsorp1ion for all of the samples below a re l…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTThe Cellulose Molecule. Physical-chemical Studies.The SvedbergCite this: J. Phys. Chem. 1947, 51, 1, 1–18Publication Date (Print):January 1, 1947Publication History Published online1 May 2002Published inissue 1 January 1947https://doi.org/10.1021/j150451a001RIGHTS & PERMISSIONSA…
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